Get maximum strength help to control your cough and relieve chest congestion with Mucinex Fast-Max DM Max. By taking doses every four hours, you'll experience the power of the cough suppressant dextromethorphan HBr and the expectorant guaifenesin, which helps thin and loosen mucus in your chest, throat and nose. The bottle includes a dosing cup so you can be sure to benefit from the proper maximum strength relief.Features & Benefits: Controls cough Relieves chest congestion Thins & loosens mucus 4 hour dosing Maximum strength formulaNo. 1 Doctor recommended otc expectorant among internists